Domain Mapping ....continued is the site in question

Sub-Domains work: eg:

Domain Mapping installed and configured correctly.

Problem 1:
Added domain mapping for
You will see this resolves to
Instead of showing the site, it shows the ISP landing page.
I remove domain mapping, it shows the blog correctly. points to so that should work ?
If you ping it shows the same IP address as
Where else could i be going wrong?

Problem 2:
Similar to Problem 1, except the domain is hosted on another server and just points to my server (as configured in domain mapping admin). This also shows ISP default landing page.

Why is this happening? 2 scenarios. 1 domain I host. 1 domain someone else hosts. Both show ISP landing page. Both configured correctly as far as I know.